Superheater for steam-boilers



PATENT@ JAN. 5, 1904.

3 SHBETS-SEEE 1..

vE. fr. HANN'AM. SUPBRHBATER FOR STEAM BOILBRS.

APPLICATION FILED APB; 15. 1903.

No MODEL.

No. 748,945. l PATENTBD JAN. 5, 1904;

E. T. HANNAM.

SUPERHEATER FOR STEAM BILERS.

APPLIGATIDN FILED APR. 15, 190s. v

No MODEL. a SHEETS-SHEET 2.

Swann@ Foz E', Tkoma Han/1mm No. 743,945.l PATENTBD JAN.- 5. 1904.

- E. T. HANNYAM.

SUPBRHBATBR EUR STEAM BOILERS.

' APPLICATION FILED APB.15, 1903.

E177: omas /cmnam y l azmm UNITED STATES Patented January 5, 1904.

PATENT OFFICE.

SU PERHEATER FOR STEAM-BOILERS.

SPCIFICATION forming part of Letters Patent No. 748,945, dated January 5, 1904:.

Application filed April 15 y 1903. Serial No. 152.642. (No model To @ZZ whom, it may concern,.-

rBe it known that I, EDWARD THOMAS HANNAM, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Superheaters for Steam -Beilers, of which the following is a specification.

The object of my invention is to provide an improved su perheat-er for steam-boilers; and the invention consists in the combination and .arrangement of parts hereinafter described and claimed.

In the drawings, Figure lis a longitudinal section of a water-tube boiler equipped with a superheater embodying my invention; Fig.

`2, a cross-section of Fig. l; Fig. 3, a crosssection of a tubular boiler equipped with my superheater, and Fig. 4 a longitudinal section 4of Fig. 3.

Steam-boxes A are provided on either side of the boiler at each end and mounted below the water-level in the boiler. The boxes on each side of the boiler are connected by two tubes B, also lying below the water-level in the boiler. At the rear boxes A are connected with the steam-space'of the boiler by means of a pipe Gand branches c, and at the front boxes A are connected with the ysteampipe D by branches d. The boxes A are provided with hand-holes ct, and the connections with branches c and d are made at the ends nearer hand-holes a, so as to render the connections easily accessible for repairs. The tubes B serve as supports for the brickwork from the sides of the boiler-drum to the side walls of the furnace.

In the form of superheater illustrated in Figs. 1 and 2 as applied to a water-tube boiler the rear boxes A protrude from the rear wall of the furnace and are connected with the boiler below the water-line by means of pipes E, provided with valves e. Pipes F, provided with a valve f, lead from pipes E to a drain-pipe or blow-od. In operation valve e is opened and valve f closed, so as to admit water from the boiler to boxes A and tubes B and to retain the water therein until steam is raised in the boiler. The presence of the water in boxes A and in tubes B prevents them from burning out while steam is being raised. Then valve e is closed and valvef openeduntil the water in boxes A and tubesA B is drained o, when valve f is closed and the superheater is filled with steam passing from the rear of the boiler forward to the steam-pipe D. Here the steam is presented first to the cooler products of combustion at the rear of the boiler and raised to their temperature. farther forward it is presented to products of combustion of gradually-increasing intensity ofV heat until it passes over the grate, where the intensity of heat is a maximum.

As the steam proceeds 6o Thus the steam is presented to the cooler products of combustion rst and extracts heat from them, as it is of lower temperature. Then it gradually passes on to hotter products of combustion; but always being cooler than the products of combustion' to which it comes it extracts heatfrom them until it passes the region of maximum intensity of heat over the grate, where it is raised to that heat and thoroughly superheated and passes to steam-pipe D.

The form of superheater shown in Figs. 3 and 4 is applied to a tubular boiler instead of a water-tube boiler. Here the connections between boxes A and tubes B and the boiler are made at the front of the boiler by means 8o of pipe E' and valve e' and is drained by pipe F and valve f. This location renders the Apipes E' and F' more accessible than they would be at the rear of the tubular boiler.

Otherwise the operation and the results ob-,85

tained are the same as in the superheater connected with the water-tube boiler.

While'l have shown and described the preferred form of application of my invention,

this is 1 capable of variation without departgo in the boiler; a connection between the pipe system and the water-space in the boiler; means for draining the pipe system; and hand-holes in the steam-boxes for access to the steam-pipes, substantially as specified.

2. In a superheater for steam-boilers, the combination of steamg-boxes mounted in the front and rear walls of the boiler-setting and accessible from the outside; a system of steam-pipes extending longitudinally through the combustion-chamber from the rear to the front below the water-level in the boiler and opening into the steam-boxes at either end; a connection bet-we en the rear steam-box and the steam-space in the boiler; a connection between the pipe-system and the water-space in the boiler, means for draining the pipe system; and hand-holes in the steam-boxes for access to the steam-pipes, substantially as specified.

3. The combination,with aboiler, of steampipes extending longitudinally through the valves e and f; connections C and c; and con-n nect-ions D and d, substantially as specified.

E. THOMAS HANNAM.

Witnesses:`

PASCHAL L. RICHARDS, -BRAYTON G. RICHARDS. 

